Wis. Stat. § 769.612: Recognition of order modified in another state.

If a child support order issued by a tribunal of this state is modified by a tribunal of another state that assumed jurisdiction under the Uniform Interstate Family Support Act, all of the following apply to a tribunal of this state:

(1) The tribunal may enforce its order that was modified only as to arrearages and interest accruing before the modification.

(3) The tribunal may provide appropriate relief for violations of its order that occurred before the effective date of the modification.

(4) The tribunal shall recognize the modifying order of the other state, upon registration, for the purpose of enforcement.